chore: update `CODEOWNERS` & `.yamllint` re: `kitchen-vagrant` [skip ci]

* Automated using https://github.com/myii/ssf-formula/pull/310

.yamllint

 # 3. All YAML files under directory `node_modules/`, introduced during the Travis run
 # 4. Any SLS files under directory `test/`, which are actually state files
 # 5. Any YAML files under directory `.kitchen/`, introduced during local testing
-# 6. All YAML files heavily reliant on Jinja; these can be tackled in a subsequent PR
+# 6. `kitchen.vagrant.yml`, which contains Embedded Ruby (ERB) template syntax
+# 7. All YAML files heavily reliant on Jinja; these can be tackled in a subsequent PR
 ignore: |
   .cache/
   .git/
   node_modules/
   test/**/states/**/*.sls
   .kitchen/
+  kitchen.vagrant.yml
   salt/osfamilymap.yaml
   salt/osmap.yaml
 

CODEOWNERS

 /Gemfile                                    @saltstack-formulas/ssf
 /Gemfile.lock                               @saltstack-formulas/ssf
 /kitchen.yml                                @saltstack-formulas/ssf
+/kitchen.vagrant.yml                        @saltstack-formulas/ssf
+/kitchen.windows.yml                        @saltstack-formulas/ssf
 /pre-commit_semantic-release.sh             @saltstack-formulas/ssf
 /release-rules.js                           @saltstack-formulas/ssf
 /release.config.js                          @saltstack-formulas/ssf